标题： 南天的强大射电源。 I. 光学识别 显示英文标题

标题： Powerful Radio Sources in the Southern Sky. I. Optical Identifications

摘要： 自20世纪60年代初以来，我们对射电星系和类星体的看法因借助第三剑桥目录（3CR）及其修订版中列出的射电源观测而得出的发现而发生了巨大变化。然而，迄今为止收集到的大部分关于3CR源的数据是使用相对老旧的仪器完成的，很少被重复和/或更新。此外，3CR仅包含位于北半球的天体，因此对新的和创新性的天文设施的访问受到限制。为缓解这些局限性，我们提出了一个基于GLEAM 4-Jy（G4Jy）目录的新射电源目录，该目录提取了可见于南半球的强大射电源，并采用了与3CR相同的选源标准。这个新目录命名为G4Jy-3CRE，“E”代表“等效”，列出了总计264个赤纬低于-5度且在约178 MHz处具有9 Jy灵敏度极限的源。我们研究了来自不同巡天任务的存档射电图，并将其与Pan-STARRS、DES和DSS数据库中的光学图像进行比较，以寻找它们射电核的光学对应体。我们将G4Jy中最初关联的中红外对应体与这里识别出的光学对应体进行了比较，并对所有G4Jy-3CRE源进行了广泛的文献搜索以收集红移估计值，最终得到了145个可靠的z测量值。 显示英文摘要

摘要： Since the early sixties, our view of radio galaxies and quasars has been drastically shaped by discoveries made thanks to observations of radio sources listed in the Third Cambridge catalog and its revised version (3CR). However, the largest fraction of data collected to date on 3CR sources was performed with relatively old instruments, rarely repeated and/or updated. Importantly, the 3CR contains only objects located in the Northern Hemisphere thus having limited access to new and innovative astronomical facilities. To mitigate these limitations we present a new catalog of powerful radio sources visible from the Southern Hemisphere, extracted from the GLEAM 4-Jy (G4Jy) catalog and based on equivalent selection criteria as the 3CR. This new catalog, named G4Jy- 3CRE, where the E stands for "equivalent", lists a total of 264 sources at declination below -5 degrees and with 9 Jy limiting sensitivity at ~178 MHz. We explored archival radio maps obtained with different surveys and compared then with optical images available in the Pan-STARRS, DES and DSS databases to search for optical counterparts of their radio cores. We compared mid-infrared counterparts, originally associated in the G4Jy, with the optical ones identified here and we present results of a vast literature search carried out to collect redshift estimates for all G4Jy-3CRE sources resulting in a total of 145 reliable z measurements.